Hi all,
I intend to use the EVP interface in order to prepare for future
changes, but currently need only SHA1 hashes. I have taken the code
sample from the EVP_DigestInit man page. It works fine. However, when
I replace
EVP_DigestInit_ex(&mdctx, md, NULL);
with
EVP_DigestInit_ex(&mdctx, EVP_sha1, NULL);
A segfault occurs at that very location. From what I have found in the
doc and on the web, EVP_sha1 should be a valid constant for this kind
of use.
I'd appreciate if someone could tell me where my misunderstanding (and
thus the segfault ;)) is rooted (platform is recent Ubuntu Linux).
Complete segfaulting code after my sig, just to be sure...
--
Thanks,
Rainer
#include <stdio.h>
#include <openssl/evp.h>
main(int argc, char *argv[])
{
EVP_MD_CTX mdctx;
const EVP_MD *md;
char mess1[] = "Test Message\n";
char mess2[] = "Hello World\n";
unsigned char md_value[EVP_MAX_MD_SIZE];
int md_len, i;
OpenSSL_add_all_digests();
if(!argv[1]) {
printf("Usage: mdtest digestname\n");
exit(1);
}
md = EVP_get_digestbyname(argv[1]);
if(!md) {
printf("Unknown message digest %s\n", argv[1]);
exit(1);
}
EVP_MD_CTX_init(&mdctx);
EVP_DigestInit_ex(&mdctx, EVP_sha1, NULL); // <-- segfault location
//EVP_DigestInit_ex(&mdctx, md, NULL);
EVP_DigestUpdate(&mdctx, mess1, strlen(mess1));
EVP_DigestUpdate(&mdctx, mess2, strlen(mess2));
EVP_DigestFinal_ex(&mdctx, md_value, &md_len);
EVP_MD_CTX_cleanup(&mdctx);
printf("Digest is: ");
for(i = 0; i < md_len; i++) printf("%02x", md_value[i]);
printf("\n");
}
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